2 (h.a.) Nitrogen in the Atmosphere

Composition of the Atmosphere: Earth’s atmosphere is made up of nitrogen, oxygen, carbon dioxide, water vapor, and many other gases, as well as particles of liquids and solids. Nitrogen is the most abundant gas in the atmosphere.

Nitrogen: Nitrogen is considered an element, because it is made of the same kinds of atoms (nitrogen atoms). Nitrogen is the most abundant gas in the atmosphere. It makes up a little more than three fourths of the air we breathe. Each nitrogen molecule consists of two nitrogen atoms.

An element is a pure substance that cannot be broken down into any other substances by chemical or physical means. Elements are the simplest substances. With each breath, you inhale the elements oxygen and nitrogen, which make up 99 percent of Earth’s atmosphere. Elements are often represented by one- or two-letter symbols, such as C for carbon, O for oxygen, and H for hydrogen.

Nitrogen is considered an element, because it is made of the same kinds of atoms (nitrogen atoms). Nitrogen is the most abundant gas in the atmosphere.